Below is a list of plants suitable for drying with desiccants. It is by no means exhaustive, and there may well be flowers which you have tried which don't appear on here! The thing to do if in doubt, and the flower doesn't appear in this list, is to experiment to see if it dries successfully. It is possible to dry practically every type of flower with desiccants. The most suitable types, however, are those with fairly simple flowers, as more complex flowers make it difficult to get the desiccant in between the petals, and this can result in uneven drying. Also, fleshy leaved plants, such as succulents, are not really suitable, as they tend to rot before they dry. Both the flowers and foliage of plants can be dried using desiccants.